221387814 has 12 divisors (see below), whose sum is σ = 479673636. Its totient is φ = 73795932.

The previous prime is 221387743. The next prime is 221387819. The reversal of 221387814 is 418783122.

It is a super-3 number, since 3×221387814³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221387819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6149644 + ... + 6149679.

It is an arithmetic number, because the mean of its divisors is an integer number (39972803).

Almost surely, 2^221387814 is an apocalyptic number.

221387814 is an abundant number, since it is smaller than the sum of its proper divisors (258285822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221387814 is a wasteful number, since it uses less digits than its factorization.

221387814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12299331 (or 12299328 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 221387814 is about 14879.1066264074. The cubic root of 221387814 is about 604.9478032513.

The spelling of 221387814 in words is "two hundred twenty-one million, three hundred eighty-seven thousand, eight hundred fourteen".